Automatic phase alteration couplings for shafts



Nov. 8, 1955 u ALDlNGER 2,722,813

AUTOMATIC PHASE ALTERATION COUPLINGS FOR SHAFTS Filed Jan. 21, 1953 INVENWP United States Patent AUTOMATIC PHASE ALTERATION COUPLINGS FOR SHAFT S Ulrich Aldinger, Stuttgart, Germany, assignor to Robert Bosch, G. in. b. H., Stuttgart, Germany Application January 21, 1953, Serial No. 332,367

Claims priority, application Germany February 9, 1952 8 Claims. (Cl. 6425) ably mounted thereon which operates with a cam track on a projection piece disposed on the other part of. the phase advancer so that an increase in speed twists the two parts of the phase displacement device more relatively to one another against spring action.

With conventional phase displacement devices of this type, the return force of the spring operates directly on the centrifugal weight, the return spring being supported against the part of the device carrying the bearing pin. in consequence these conventional forms of such devices lack the necessary spring actuation required for working as noiselessly as possible between the two parts of the device. This disadvantage is avoided by the arrangement of this invention, in that the return spring is disposed between the bearing pin and the projection on the other part.

An advantage of the device of this invention is that it can withstand heavy loading due to rapid changes in turning moment of the device.

The invention is further described with reference to one form of construction shown in the drawing.

In the drawings Fig. 1 shows a section along the line II of Fig. 2 and Fig. 2 a section along the line IIII of Fig. 1.

One part of the phase displacement coupling is sei cured in the conventional manner by means of its hub 1 to a driven shaft (not shown). The hub 1 is in one piece with a radial flange 2, forming a boss for the attachment of parts of the coupling. A pot-shaped casing 3 is screwed on the edge of the flange 2 which is provided with a thread. Into the flange 2 two pins 4 are firmly pressed on each of which a centrifugal weight 5 is pivotably mounted. The centrifugal weights operate with cam tracks 6 on projections 7 integral with a ring 8 forming a boss for attachment of other parts of the coupling. The ring 8 carries on the side opposite the projections, coupling claws 9 in which a driving shaft (not shown) engages in the conventional manner through a coupling flange (also not shown). The ring 8 is connected to a pot-shaped part It) by spot-welding as is shown at 11. This part 10 is mounted in the casing 3 and forms a bearing support for the driving part of the device which, as already described, is secured to the driven shaft.

The projection 7 and the pivotal pins 4 are recessed for the reception of the compression springs 12 mounted between the bearing pins and the said projections.

With increasing speed of revolution, the centrifugal weights swing outwards and turn, by reducing the clearance of the projections from the bearing pins, the driven part of the device relative to the driving part. The return springs are compressed at the same time. So that no forces may operate on the centrifugal weights which 2 could lead to the clamping of the centrifugal weights on their pivotal pins, the centrifugal weights have the same thickness at pivots 13 as between the cam tracks and the end of the centrifugal weights remote from the pivots.

The ring 8 and the base of the casing 3 lie in one plane. Between the bearing surface of the ring 8 and the inner surface of the opening of the base of the casing, a packing ring 14 of conventional type is fitted. A packing ring 15 of the same type is situated between the inner surface and the hub 1. This sealing renders it possible for the device to be filled with oil. For introducing the oil, the flange 2 hasan opening 16 which is closed by a screw 17.

As the ring Sis firmly connected by welding to the potshaped part 10, the driving side of the device consists practically of a single piece. The driven side of the device has only one connection point, which is formed by strong bearing pins for the centrifugal weights. By this arrangement a type of construction of phase displacement coupling is obtained which can withstand considerable stress. The mounting of the driving side of the device in the driven part at the periphery of the part 10 and the filling with oil gives, under conditions of high fluctuations of torque, a good damping of the oscillations occurring thereby. -Phase displacement couplings are subject to such great fluctuations of torque particularly when it is used on injection pumps for internal combustion engines when changing the time of the injection. It is obvious that instead of forming cam surfaces on the ends of the pivoted weights to cooperate with cylindrical pins or projections, the ends of the pivotal weights may have cylindrical surfaces cooperating with cam shaped surfaces on the projections or pins 7.

What I claim is:

1. A centrifugally operated phase displacement coupling for a pair of shafts comprising a pot shaped casing adapted to be connected to each of the shafts, said casings being disposed in intermeshing relation to form a closed oil tight receptacle, each of said casings having closed ends disposed in confronting spaced relation and adapted to be connected to their respective shafts, pivots on one of said ends, centrifugal weights mounted on said pivots and having cam tracks, pins on the other end disposed in cooperating engagement with the cam tracks and springs positioned between said pins and said pivots.

2. A centrifugally operated phase displacement coupling for a pair of shafts comprising a pair of boss elements adapted to be connected each to one of the shafts and disposed in spaced confronting relation, said boss elements having inwardly extending concentrically related peripheral annular flanges and said boss elements and flanges forming a receptacle, sealing means interposed between the flange of one boss element and the other boss element to provide an oil tight receptacle, pivots carried by the inner face of one of the boss elements, centrifugal weights mounted on the pivots and having cam tracks, pins on the inner face of the other boss element disposed in engagement with the cam tracks and compression springs positioned between the pins and the pivots.

3. A centrifugally operated phase displacement coupling as claimed in claim 2, wherein said pivots and pins are provided with recesses to seat the ends of the springs.

4. A centrifugally operated phase displacement coupling for a pair of shafts, including in combination, a plate element for connection to one shaft, pivots on said plate element, centrifugal weights having cam tracks and mounted on said pivots, a disc for connection to the other shaft, pins on said disc having co-operating engagement with said cam tracks, springs between the pivots and the said pins, said plate element and disc being disposed in spaced confronting relation and having inwardly extending concentrically related, peripheral annular flanges,

said plate element and its flange and said disc and its flange forming intermeshing pot shaped casings, and sealing means interposed between the casings for sealing the casings to provide an oil-tight receptacle.

5. A 'centrifugall-y operated phase displacement coupling as claimed in claim 4, wherein 'said pivots and pins are recessed to seat the-ends f -.the springs.

6. A centrifugally operated phase displacement coupling for a pair of shafts, including in combination, a plate element and a disc disposed in parallel planes radial to said shafts, means to \connect the plate element and the disc each to -a shaft, :a pivot on said plate element, a centrifugal weight having a cam track and mounted on said pivot, a pin on the disc having cooperating engagement with said cam track, a spring .be-

tween said pivot and said pin, a pair of pot shaped casings intermeshing to form a closed oil tight receptacle,

the ends of said casings being-defined by said plate --element and said disc, and annularpackings between said disc of the one casing and the other casing.

7. A centrifugally operated phase displacement coupling for a pair of shafts, including in combination, a plate element and a disc disposed-in parallel planes radial to said shafts, means to connect the plate element and the disc each to a shaft, a recessed pivoton the plate element, a centrifugal weight having a cam track and mounted on said pivot, a recessed pin on the disc having co-operating engagement with said cam track, a compression spring seated in the recess in said pivot-and the d recess in said pin, a pair of pot shaped casings intermeshing to form a closed oil tight receptacle, the closed ends of said casings being defined 'by said plate element and said disc, and annular packings between the disc of the one casing and the other casing.

8. A centrifugally operated phase displacement coupling for a pair of shafts, including in combination, a hub for connection to one shaft and having a radially extending plate element thereon, a disc disposed in a parallel plane to said plate element and adapted to be attached to the other shaft, arpivot on the-plate element, a centrifugal weight having a cam track and mounted on said pivot, a cylindrical .pin on the disc engaging with said cam track, a spring between said pivot and said pin, a'pair of potishaped casings intermeshing to formva closed oil tight receptacle, the closed ends of said casings being defined by the plate element and said disc, and annular packings between the hub of the one casing and the disc of the other casing and between said disc and the one casing.

ReferencesCited in thefile of this patent UNITED STATES PATENTS 1,997,459 Fitzsimmons Apr. '9, 1935 FOREIGN PATENTS 310,785 Great Britain 1929 426,976 Great Britain Apr. 12, 1935 

